package com.ma.dao;


import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

//操作数据库的公共类
public class BaseDao {
    private static String driver;
    private static String url;
    private static String user;
    private static String password;

    static{
        InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
        Properties properties = new Properties();
        try {
            properties.load(is);
        } catch (IOException e) {
            e.printStackTrace();
        }

        driver = properties.getProperty("driver");
        url = properties.getProperty("url");
        user = properties.getProperty("user");
        password = properties.getProperty("password");
    }

    public static Connection getConnection(){
        Connection connection = null;
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        try {
               connection = DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return connection;
    }

    //查询公共类
    public static ResultSet execute(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet,String sql,Object[] params){
        resultSet = null;
        try {
             preparedStatement = connection.prepareStatement(sql);

            for (int i = 0;i<params.length;i++){
                preparedStatement.setObject(i+1,params[i]);

            }
            resultSet = preparedStatement.executeQuery();

        } catch (SQLException e) {
            e.printStackTrace();
        }

        return resultSet;


    }


    //编写增删改公共方法
    public static int execute(Connection connection,PreparedStatement preparedStatement,String sql,Object[] params) throws Exception{
        int updateRows = 0;
        preparedStatement = connection.prepareStatement(sql);
        for(int i = 0; i < params.length; i++){
            preparedStatement.setObject(i+1, params[i]);
        }
        updateRows = preparedStatement.executeUpdate();
        return updateRows;
    }

    //释放资源
    public static boolean closeResource(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet){
        boolean flag = true;
        if(resultSet!=null){
            try {
                resultSet.close();
                resultSet = null;
            } catch (SQLException e) {
                e.printStackTrace();
                flag = false;
            }
        }
        if(preparedStatement != null){
            try {
                preparedStatement.close();
                preparedStatement = null;
            } catch (SQLException e) {
                e.printStackTrace();
                flag = false;
            }
        }
        if(connection != null){
            try {
                connection.close();
                connection = null;
            } catch (SQLException e) {
                e.printStackTrace();
                flag = false;
            }
        }
        return flag;

    }
}
